Occidental Petroleum Corporation (NYSE: OXY) is an international oil and gas exploration and production company with operations in the United States, Middle East and Latin America. Headquartered in Houston, Occidental is one of the largest U.S. oil and gas companies, based on equity market capitalization. Occidental's midstream and marketing segment gathers, processes, transports, stores, purchases and markets hydrocarbons and other commodities. Occidental's wholly owned subsidiary, OxyChem, is a major North American chemical manufacturer.Occidental's success is built on technical expertise, business acumen, strong partnerships and proven ability to deliver lasting results. With approximately 35,000 employees and contractors worldwide at year-end 2015, they are committed to being a Partner of Choice® everywhere they operate. Occidental is committed to respecting the environment, operating safely and upholding high standards of social responsibility throughout the company's worldwide operations.